#include <fstream>
#define ll long long
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");

ll A, N, inv, garbage, d;

ll euclidextins(ll A, ll B, ll &x, ll &y)
{
    if (!B) { x=1; y=0; return A; }
    ll x0, y0, d=euclidextins(B, A%B, x0, y0);
    x=y0; y=x0-(A/B)*y0;
    return d;
}

int main()
{
    f>>A>>N;
    d=euclidextins(A, N, inv, garbage);
    while (inv<0) inv+=N;
    g<<inv<<'\n';
    return 0;
}